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Title: INHERITANCE AND CATEGORIES OF RUSSIAN WHEAT APHID (HOMOPTERA: APHIDIDAE) RESISTANCE IN STARS-225217, A RED WINTER WHEAT (DUPLICATE ENTRY; SEE LOG 58453. CORRECTION TO JOURNAL/EQUIVALENT)

Author
item Baker, Cheryl
item Porter, David
item Webster, James

Submitted to: Thomas Say Publications in Entomology
Publication Type: Proceedings
Publication Acceptance Date: 6/24/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary: The Russian wheat aphid (RWA) is the most damaging insect pest of cereal crops in the western United States. To control this pest and minimize damage to the wheat crop, without using chemical pesticides, requires the development and use of naturally resistant wheat cultivars. Due to the importance of the RWA, the development of RWA-resistant wheat cultivars is a high priority in many public and private wheat breeding programs. In order to produce and distribute RWA-resistant wheats as quickly as possible, the breeder must know how the plant resistance trait affects the aphid pest and how this trait is inherited. Research at the USDA-ARS Plant Science Research Laboratory at Stillwater, Oklahoma, has focused on determining the type of resistance and the genetic control of RWA resistance in STARS-225217 (a red winter wheat germplasm line). Crosses were made between STARS-225217 and the susceptible wheat cultivar 'Chisholm'. Seedling plants of the F1, F2, and F3 generations were artificially infested with Russian wheat aphids in the greenhouse. Results of this study indicate that RWA resistance in STARS-225217 is controlled by a single dominant gene. Tolerance of aphid feeding was the main resistance mechanism measured in STARS-225217.

Technical Abstract: The Russian wheat aphid, Diuraphis noxia (Mordvilko), is a serious pest of cereal crops in the western United States. Therefore, the development of Russian wheat aphid-resistant cultivars is a high priority in many wheat (Triticum aestivum L.) breeding programs. Understanding the type of resistance and its genetic control will aid in the timely development of Russian wheat aphid-resistant cultivars. This study was conducted to determine the inheritance of Russian wheat aphid resistance and the categories of resistance in STARS-225217 (a red winter wheat line selected from PI 225217). Crosses were made between STARS-225217 and the susceptible wheat cultivar 'Chisholm'. F1, F2, and F3 progeny were artificially infested with Russian wheat aphids in the greenhouse. F1 data indicated that resistance is dominant, with no evidence of cytoplasmic effects. F2 and F3 data indicate that resistance in this line is controlled by a single egene; the F2 showed a 3R:1S segregation ratio, and F3 lines segregated in 1R:2 Seg:1S ratio. Antibiosis and preference tests indicated that the STARS-225217 was not significantly different from the susceptible check. Tolerance tests indicated that STARS-225217 was significantly more tolerant to Russian wheat aphid feeding than the susceptible check for all parameters tested. Therefore, tolerance to Russian wheat aphid appears to be the most highly expressed category of resistance in STARS-225217 and it is controlled by a single, dominant gene.